16401808 has 10 divisors (see below), whose sum is σ = 31778534. Its totient is φ = 8200896.

The previous prime is 16401799. The next prime is 16401809. The reversal of 16401808 is 80810461.

It can be written as a sum of positive squares in only one way, i.e., 11614464 + 4787344 = 3408^2 + 2188^2 .

It is not an unprimeable number, because it can be changed into a prime (16401809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 512541 + ... + 512572.

Almost surely, 2^16401808 is an apocalyptic number.

It is an amenable number.

16401808 is a deficient number, since it is larger than the sum of its proper divisors (15376726).

16401808 is a wasteful number, since it uses less digits than its factorization.

16401808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025121 (or 1025115 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 16401808 is about 4049.9145670001. The cubic root of 16401808 is about 254.0761546506.

The spelling of 16401808 in words is "sixteen million, four hundred one thousand, eight hundred eight".